@Override
protected MathTransform computeMathTransform() throws FactoryException {
try {
String tmpdir = System.getProperty("java.io.tmpdir");
NADCONTransform trans = new NADCONTransform(this.writeDeltaFile(1, tmpdir+"/nadcon.laa").getAbsolutePath(),
this.writeDeltaFile(0, tmpdir+"/nadcon.loa").getAbsolutePath());
return trans;
} catch (ParameterNotFoundException e) {
throw new FactoryException(e);
} catch (IOException e) {